Ing machine cobfobation



lA. F. POOLE CALCULATING MACHINE March 18,l 1924.'

Fild 'Auat l5. 5 Sheets-'Sheet 1 darch 18, 1924;

A.F.POOLE CALCULATING MACHINE Filed Auzl l5. 1921- 5.Sheets-Sheet 5 INVENTUR VWTNEEEEE Q-Iy 52ML, i# @y .5i/MJL HIE ATTDHNEY y March 18, 1924.'

' A. F. POOLE GALCULATING MACHINE Filed Aug. l5 19241 5 Sheets-Sheet 5 F INVENTRA .Air/12; iR@

@/M- H15- ATTUHNEY WITNEEEEE Patented Mar. 18, 1924.

UNITED sTATi-:s

AiuiTaNT carica.

ARTHUR F. POOLE, E XENILWORTH, ILLINOIS, .ASSIGNOB TO REMINGTON ACCOUNT- ING IACEINE CORPORATION, 0F YORK, Y., CORPORATION 0F NEW YORK.

cALcUna'iINe nonnen.

Application lled'August 15, 1931.` Serial rNm 498,896.

To all whom zt may concern.'

Be it known that I ARTHUR F. POOLE, a citizen of the United States, and resident of Kenilworth, iii the county of Cook and State of Illinois, have invented certain new and -useful Improvementsin Calculating Machines, of which the followingis a specification. t L

My invention relates' to calculating machines and it has for its principal purpose to provide certain improvements in clearance proof mechanism :for such machines. I ave shown my vinvention ap lied to a combined t pewritin and calcu atin machine in whic the tota izers are clearediy setting their actuators'for subtraction and copying lthe tota-l by operatingv the numeral keys. In

machines of this character the to'talizer willy always come4 to zero rovided the total has been correctly co ieg.

l mechanism I provi e means for notifying the operator incase of an erroneously copied total under conditions somewhat more complex than usual.

To the above and other ends my invention consists in certain features of construction and combinations and arrangements of parts,

all of which will be fully set forth herein. and particularly pointed out in the claims. lOne form of my invention is illustrated in the accompanying `drawings in which- Figure 1 is a more or less conventional or diagrammatic front view of a combined typewriting and calculating machine withm invention embodied therein, parts only o the mechanism of the machine being shown. This view is on a smaller scale than the remainiiig figures.

Figure 2 kis a partial front to rear vertical section of the machine, the lowerpart of the section being taken on line 2 2 of Figure 5 and only so much ofthe machine being shown as is necessary for an Vunderstanding of my invention.

Figure 3 is a rear elevation of part o f the mechanism with parts broken away, the mechanism being in normal position.

Figure 4 is a similar view but with some arts omitted and showing the mechanism so in the position it occuples when the machine has been locked by theincorrect copying of the total from one'of the totaliz'ers.

Figure '5 is a planview in horizontal Section about on the line 5 of Figure 4.

but

By my improved F igure 6 is similar to a part of Figure 5 ows the mechanism in normal osition. Figure I is a fragmentary top p an view ofthe mechanism at the middle of the machine andassociated with one of the vertical f totalizers. i

Figure 8 is atop view in section on the line` 8-#8 of Figure 12. v

Figure 9 isa similar view on the line 9-9 of Figure 12.

Figure 10 is a vertical section on the line 10-10 of Figure 3 andllooking toward the -ri ht in said figure.

igure 11 is a rear elevation of the parts ofmy invention at the middle of the machine."

Figure 12- is a vertical section on the line 123512 of Figure 7, and looking toward'the ri v e words right and .1left as used herein, refer to the right and left of the operator as he sits at the machine.

. By way of illustration-I have shown my invention applied to a RemingtomWahl combined typewriting and calcu ating machine, sometimes called the Remington accounting machine, of the sort shown and described in the patent to J. C. Wahl No.1,349,024, dated August 10, 1920. Except as hereinafter ointed out, the whole machine may be identical with that shown in the said `Wah1 patent. It will ofcourse be understood that as far as m invention is concerned, the machine may e otherwise constructed; that is to say, the invention may be adapted or applied to other types of calculating machines.

The machine shown in the Wahl patent referred to comprises a Remington typewriter with the Wahl calculating mechanism attached thereto. In .the present drawings I have shown in Fig". 1 a-conventional representation of the typewriterplaten 13, and some of the numeral keys- 14. The latter usually constitute the back one of-four rows. of keys in the typewriter. In Fig' 2 I have shown the front end of an arm 15 that 'projects from the typewriter carriage and connects it with the main truck 16 of the calculating mechanism, said connection `comprising a screw 1 7 which connects the arm 15 with a bracket 18 secured to the end of the truck. There is lone. of these connections at each end of the truck.

The calculating attachment comprises a rigid framework including a casting 2O which is secured by means well known in the art to the stationary framework of the typewriter.

-The truck 16` is made of theA form well known in this machine and it is guided at about the middle of the machine by three wheels or rolls, the upper' one of. which 2l is shown in Fig. 2. This has an integral arbor 22, Fig. 8, running in an adjustable eccentric bushing 23 and held in place by a screw 24 screwed into the upper end of the arbor 22. The bushing 23 passes through a piece of sheet metal 25` the front end of which constitutes a pointer to indicate what section of the totalizer is in position for operation.

In the presentinstance I have shown nine vertical totalizers 26, 27, 28, 29, 30, 31, 32, 33 and 34 mounted side by side on the truck 16 and each s'ecured in place by the usual hand operated latch 35 co-operating with the toothed bar 36. In Fig, 1 I have omitted to illustrate these latches 35 on some of the totalizers in order to avoid obscuring other parts of the drawing. The vertical totalizeis are adapted to be. operated one wheel of one totalizer at a time by a main master wheel 37 'after the ordinary fashion of the Wahl machine. Associated with said master wheel is also a main master dog 38 having an upwardly projecting arm adapted to opera-te certain releasing devices in the totalizer and a rearwardly projectingI arm adapted to enter the notches in a rack bar 40 secured to thc truck 16 so as to lock said truck against stepping while the master wheel 37 is turning. The machine also includesl a universal bar 41 mounted by several arms 42 on a rock shaft 43, which universal bar is operated uniformly by all of the numeral keys 14 in the well known manner of the IVahl machine. In the first part of the down stroke of the key this bar is swung toward the front of the machine; it drops back to normal position at the end of the down stroke and is swung back toward the rear of the machine at the upstroke of the key. Said universal bar controls the master dog 38 and various other devices. l

The machine also includes two universal or cross-footing totalizers 44 and 45 both mounted on a jumping auxiliary truck 46 mounted for a limited right and leftward travel by ball bearings 47 in grooved rails 48 constituting parts of a fixed casting or frame piece 50 which is secured by screws 51 (Fig. 2) to certain frame plates 52 and 53 which in turn are secured to the main casting 2O of the calculator. The truck 46 is normally drawn toward the right by means of a coiled spring 54 running over a pulley and at one end connected to a stud projecting from the casting 50 and at. the other end connected to a stud projecting from the truck 46. Said truck is intermittently moved step-by-step toward the left by means of a hook 'or ick-up beam 55 pivoted thereto atv 56 anc adapted to engage a series of lugs 57 one projecting downward from the rear right-hand corner of each of the vertical tatalizers. The auxiliary totalizers 44 and 45 are thus drawn across two auxiliary master wheels 58, so that either one or both of said auxiliary totalizers can be operated in unison with whatever vertical totalizer happens to be in use at the time. The machinecontains means fully described in the IVahl patent above referred to whereby either of the master wheels 58 can be caused to operate in conjunction with the main master wheel 37 either in addition or subtraction, or whereby it can be disconnected as desired. This control of the auxiliary master wheels can be effected manually and it can also be effected automatically, the automatic means described in said patent including two cams mounted on each of the vertical totalizers, namely, a forward cam 60 and a rear cam 61, the former oontrolling the master wheel 58 for the lefthand auxiliary totalizer 44 and the latter controlling the master wheel for the righthand auxiliary totalizer 45. As described in said patent, each of said cams is adjustable to three positions, the uppermost position of the cam causing the auxiliary master wheel to add, the middle position causing said master wheel to be disconnected and the lowermost .position causing said master wheel to subtract. In Fig. 1 I have shown these cams set according to a definite program of operation which will be explained hereinafter.

The cams 60 and 61 co-operate with two follower rollers 62 and 63 (Fig. 2), which rollers are spring pressed upward and are connected through a chain of mechanism fully described in the cited lVahl patent to the gear trains of their respective master wheels. Said patent also shows and describes a correcting lever or handle by depressing which the operation of all three of the master wheels can be simultaneously reversed so that if a digit were incorrectly written, it can be canceled from whatever wheel in the various registers it may have been entered into by depressing said correction key and operating the same digit key that had been erroneously operated. I have deemed it unnecessary to illustrate all of this mechanism herein because it is fully disclosed in the prior patent and would unnecessarily complicate the drawings and description of theprescnt case if shown here.

fhen the last digit of any number has beenv written, the typewriter carriage .and the truck 16 take a step to the left, which step results in the hook 55 being cammed loose from the 1u v57 and the auxiliary or cro footer truc 46 being restored or .jumped back to its extreme" right-hand position by means of the spring 54. Said truck is arrested by means of albar 64 mounted thereon and projecting to the right therefrom, encountering a lever 65 whlch is pivoted at its lower end at 66 to the right-hand frame plate 52. This lever is provided with a spring which normally holds it sli htly away from said plate 52 as shown in I* ig. 1 but when the truck comes back to its righthand position said spring is overcome and the llever 65 moves a short distance toward the right until arrested by said plate 52. Said lever has connected thereto a link or draw bar 67, the left-hand end of which is articulated with va bell crank 68 pivoted at 7 0 in the stati'onaryframework. The horizontal arm of 'this lever has depending therefrom and pivoted thereto a pendent 71,

the construction being such that said pend; .ent 'is raised when the lever 65 occupies its left-hand position and is lowered when said lever is moved toward theright. The pendent 71 can be swung on its pivot 72 by means of a link 73, the left-hand end of which is..connected to the lower arm of a bell crank .74, the horizontal arm of which carries a roller 75, Fi 2, which is normally held up by a spring but which is depressed whenever a vertical totalizer is over 'its master wheel 37 by means of a. bar or trackway 76 mounted in said totalizer. The universal rock shaft 43 has an arm 77, Fig. 1, mounted thereon in such position thatA when the pendent 71 is swung toward the right by the de ression of the roller and when said pen ent occupies its lower position due to the lever 65 being inits rlghthand position, then the pendent 71 stands in the path of thearm 77 and prevents the operation of the universal bar 41 and thus locks the machine against operation by its keys. `This train of locking mechanism only partially shown and briefly described herein is a familiar part of the Remington-Wahl cross footing machine which has been on the market for some time, and said mechanism is fully shown and described in the patent to Wahl No. 1,270,471, dated June 25, 1918.

In the. form of my invention shown in the .present instance, I utilize this lock as a clearance telltale but it will be understood that some other lock or other detecting means can be employed instead if preferred.

I have shown the machine set up for writing and computing a statement in the form shown inFig. 1 where the paper 79 on the platen 13 is shown just above the row of vertical totalizers. This is one of a greatl variety of forms which can be` handled on this machine. The form illustrated is designed to keep account of the receipts of three divisions of a railroad. said receipts 'and its rear cam 61 set for subtract.

being classified with respect to said three divisions and also with respect to receipts from freight and from passengers. The last three columns corresponding to the right-hand three totalizers 32, 33 and 34, are devoted to total receipts from freight, total receipts lfrom passengers, and total receipts from both sources put together. Thus ou August 1st', there were receipts from freight and assenger trafiic as indicated in detail in the rst six columns. The 7th column must therefore indicate the sum of the 1st, 3rd and` 5th columns; the 8th column contains the total of the items written on that day in the 2nd, 4th and 6th columns; and the 9th col-- umn contains the total amount which could be arrived at either by adding the items written in the first six columns or by addingthe items written in the 7th and 8th columns. As will be observed by the setting of the cams 60 and 61 in Fig. 1, in the 1st, 3rd

usy

and 5th columns, which contain the details of freight receipts, the front cam 60 is set in its highest position and the rear cam 61 in its middle position so that freight items will be added on the left-hand auxiliary totalizer 44 and will not affect the right-hand "totalizer 45. The operator then passes to column 7 and copies from totalizer 44 the total.- freight which on August 1st amounted to $1,885. The totalizer 32 has both of its cams set to the disconnect position so that the copying of this freight has no effect at all on either of the c'ross'totalizers. The carriage is then moved to add the total pas-.

senger receipts into totalizer 33 and to write said receipts in the eighth column. On Aulgust 1st this amounted to $1,492. Said totalizer 33 has itsA front cam 60 set for add The result is thatthis amount $1,492 is added into the cross totalizer 44 and subtracted from cross totalizer 45.' If this copying is correctly done cross totalizer 45 will be cleared by this operation and theamount ofthe pas- 'a senger receipts will be added 'on cross total. izer 44 to the amount of receipts from freight which had already been indicated on that totalizer. After writing in the 8th column therefore the right-hand cross totalizer should'be clear and the left-hand cross to' talizer shows the total receipts which'are then copied therefrom into the 9th column and added into the last vertical'totalizer 34.l

' $3,377 has no effect on totalizer 45 but clears totalizer 44, provided the amount is correctly copied.

From the above description it will be noted that, in computing the particular forni shown in the drawing, every time a number`is written in the 8th column and added in totalizer 33, the right-hand totalizer 45\should be cleared and will be ifthe amount has been correctly copied; and also every time a number'- is written in the 9th column and correctly copied from totalizer 44, said totalizer 44 will be cleared. My clearance proof mechanism is therefore so designed as to call the operators attention to the fact in case totalizer 45 is not clear after writing in the 8th column and also in case totalizer\44 is` not clear after writing in the 9th column. It may be added that in Fig. l the parts are shown in position for writing the last digit in the 3rd cohunn.

The means for detecting whether or not one of the totalizers 44 or 45`is clear can be understood from Fig. 2. Said totalizers are of the ordinary lVahl 4construction shown in the Vahl patents above referred to. They include a series of carrying wheels 78 which have co-operating with them the ordinary means for transferring or carrying the tens and each ofsaid carrying wheels is geared through an idler pinion with the pinion of the numeral wheel 81. These pinions 80 are thin, ten-toothed pinions projecting from the sides of their dial wheels or nu` ber wheels 81, and each of them has one t its teeth 82 made shorter than the rest. This short tooth 82 is in such a position that when the dial wheel 81 indicates zero at the sight opening, said tooth 82 lies just in front of one of the arms or teeth of a feeler consisting of a comb S3, which comb i's pivoted at its end on trunnious 84 projecting into holes in the side plates of the totalizer. I have not deemed it necessary to illustrate this comb in detail as devices of the same general character are well known in the art. The comb comprises a body part or rock shaft part extending from one of the trunnions 84 to the other and a thin arm projects upward in such position that it can be pressed against the end of that tooth of the pinion 80 whichhappens to be opposite to it at the time. In Fig. 2 one of the long teeth of the pinion is opposite the comb 83 and this particular wheel therefore does not stand at Zero and the comb cannot move further to the front of the machine than shown inthe drawings. If, however, that particular register wheel stood at zero the short tooth 82 would be opposite the comb 83 and would not prevent said comb from rocking a short distance toward the front. If a single wheel were out of its Zero position the forward motion 0f the combl would be blocked, as shown, but if the whole totalizer was clear,that is to say, if all the wheels stood at zero, then the comb would rock forward. Said comb has a pin 85 projecting therefrom through an opening in the right-hand casing plate of the totalizer, said opening being of sufficient size to allow of the necessary rocking of the comb front and back. Said pin projects into a slot in a leve'r 86 which is pivoted to the outside of the totalizer at 87 and which has pivoted to its lower end a link or push bar 88 which extends rearward, as shown in Fig. 2. This push bar is pulled toward the rear by a light spring 90 which normally holds the comb 83 out of contact with the pinions 80. The bar 88 projects through a. hole 91 in the truck 46 and terminates justback of said truck as shown in Fig. 2. It is desirable that this hole be in the nature of a slot which, for reasons that will presently be explained, allows the bar at its rear end a slight up and down motion but does not allow it to move in a right and left-hand direction. As it is more convenient to make such a slot in a piece of sheet metal than it is in casting, I have provided anescutcheon 92 of sheet metal seated in a depression of the truck 46 where it is secured by screws 93, and the hole 91 can be punched in this escutcheon very easily of the correct size and shape. That part of the hole Athat comes through the casting 46 therefore needs only to be of sufficient size for the purpose and-need not be accurate. The whole construction is such that the bar 88 is normall maintained partly by its weight and part y by the inclination of the spring 90 1n the lowerpart of its slot 91 and as far toward the rear as it can go, its motion in that direction being limited by'the pin 85. The construction is also such that if the totalizer is clear the bar S8 can be slid toward the front of the machine by sufficient force to overcome the spring 90 but if thetotalizer is not clear said bar cannot be slid forward endwise. It will be understood that there is one of these combinations of comb 83, bar 88 and other associateddevices on each ofthe totalizers 44 and 45. The two bars 88 co-operate respectively with two levers 94 and 95 which are pivoted on rigid studs 96, which studs are rigidly secured to a sheet metal bracket 97 projecting forward from the casting 50, and between said casting and the auxiliary truck 4G. as seen from the rear in Figs. 5 and 6. They stand normally in the position shown in Fig. 6 and just before the cross footer truck is cammed loose and makes its jump toward the, operators right (toward the left in these figures) the bars l88 stand about in the position shown in Fig. 6. Each of the levers 94 These levers are shown in plan view l ymeaux i so that when the truck ju'mps back after the computation of a number, there is a tendency for said bars 88 to rock said levers, due to the ends of the bars encountering said inclines. j In Fig. 5 the parts are shown in the positions they occupy in the course of the ackward jump of the cross footer truck at a time when neither of the totalizers stands at zero, and it will be observed that the levers 94 and 95 have both been rocked by the bars 88. The truck 46 does not stop `in this position but moves on further toward the left as viewed in Fig. 5 and until arrested by the means abovedescribed. It is not desired that the bars 88 shall rock the levers 94 and 95 during the step-by-step motion of the carriage in writin a number. Eacli of the levers 94 and 95 1s therefore provided with a part bent downward to form an incline 99, Figs. 4 and 5, and during the travel of the truck 46 in writing a number the ends of the bars 88 run onto these inclines and said bars are lifted, this motion being permitted by the shape of the slot 91 so that in the leftward travel of the truck the bars ride idly over the levers and do not engage the forward edges of the levers. When they reach the final position shown in Fig.` -6 they drop downto their normal positions ready to engage the forward edges of the levers, as best .shown in Figs. 7-12. Said levers will be rocked in case the totalizers are not clear, but if the totalizers are clear they will not be rocked because the levers are held in their normal positions shown in Fig. 6 by springs 100 which are stiffer than the springs 90 so that if the bar 88 is free to move toward the front of the machine it will do -so rather than rock the levers 94 and 95. Each of the springs 100 i is rigidly mounted in one of the studs 96 andit extends toward the end of the lever where it is bent downward as shown in Fig. 4, its downwardly bent end l constituting a pivot whereby a pin 101 is pivoted to the lever. Said pins extend rearward-through suitable holes in the casting 50 and `normallA extend also through holes in vertical slide liars 102, which slide bars are set in suitable grooves milled in the rear face of the casting 50 and held in place by a cover platev103 which is secured to said casting by screws 104. Each lof the slides` 102 is which is secured to the upper part of the casting 50 by a screw 106. The construction is such that each of the pins 101 normally holds its slide 102 in its upper position against the tension of thespring 105 but if one of the totalizers is not clear when the truck 46 takes its jump toward the right, then the pin 101 corresponding to that totalizer will be'withdrawn and the slide 102 will be free to be moved downward by vits spring cerned.

pressed downward bly a flat spring 1054 105 as far as these pins are con- Said slides 102 are normally held up by other devices also, as will presently j appear.

The two slides 102 co-operate with a horizontal slide 107 havin two inclined lugs 108, the construction eing such that if either of the slides 102 be forced downward the slide 107 kwill be forced toward the operators right. Said slide is prolon ed toward the operators right `(toward the eft in Figs. 36), being guided `bysuitable grooves cut in the rear face of the casting 50 andheld in place at one end by the frame plate 103 and near its other end by'another plate 110. Said slide bar has an arm 1'11 sov (Figs. 3 and 5) projecting therefrom ltoward the front of the machine in such position that when the bar is pushed toward the operators right said arm will act on the lever 65 and force it to its locking position, as

shown in 5. As shown in Fig. 3 the slide bar 107 is prolonged be ond the frame plate 53 where it is provide with a button 109 by operating which the bar can be lforced back to its normal position, restoring the slides 102 to their normal positions where they will be caught byethe pins 101 and other devices presently to described.

If the mechanism thus far described were not checkedby other devices, it would lockup the lmachine every time the cross-footer.

truck 46 made its jump back to normal position. I have therefore provided means in addition to they ins 101 forV holding up the slides 102 and or releasing said slides se` lectively so that the right-hand slide V102 corresponding to the-totalizer 45 can be released at the end of any desired column and the'left-hand slidev 102 corresponding to'the totalizer 44 can be released at the end of any other desired column. Said selective means are preferably controlled by selected ones of the. vertical totalizers, this being the most convenient arrangement although it will of course be understood that other .means can.

be provided if desired. In working on the particular form shown in Fig. 1 the righthand slide 102 is released in the sub-units lposition of the totalizer 33 and the leftand slide 102 in the corresponding position ofthe totalizer 34,

The additional means for holding up the slides 102 comprises la sort of double hook (Fig..3) consisting of alever arm 112 having two hook-like projections 113 at its lower end and each of the slides 102 has a beveled lug or tooth 114 normally overlying one of the hooks or lugs 113 as'shown in Fig. 3. The lever 112 normally occupies the middle position shown in that figure where it supports both slides and if the lever be rocked in one direction it will release one slide, as shown in Fig. 4, and if `it be rocked in the other. direction it will release the lao - in effect a V-pointed tooth with its point directed rearward, the difference between them being that he cam 117 is higher than the cam 118. The usual bracket 120, Fig. 11, on which the wheel 21, the pointer 25, etc. are ordinarily, mounted, has been machined off at the top and a plate 121 secured thereto by means of screws 122. This plate 121 has two grooves milled out on its under side at right angles to each other, one extending in a right and left-hand direction at the back and the other extending in a front to rear direction just at the lett of the bushing 23. In said front to rear slot there lie one on top of the other an upper slide bar 123 and a lower slide bar 124, the former being in the horizontal plane ot' cam 117 and the latter in the plane of cam 118, and both pointed at their forward ends so that when one of said cams 117 or 118 stands in front of these bars, as it does in the subunits position of the totalizer, one of said bars will be operated, the upper one by cam 117 and the lower one by cam 118. Each of the bars 123 and 124 has its rear end inclined at 125 but the inclines extend in 0pposite directions.

, In the right and left-hand groove in the plate 121 there is a slide bar 126'having two notches 127 and 128, leaving between them a tooth with inclined sides. In the normal position of the parts shown in Fig. 7 the incline 125 on the upper slide 123 engages this tooth on one side and the corresponding incline on the lower bar 124 engages said tooth on the other side, so that if the upper bar 123 be pushed to the rear by the cam 117, as shown in Fig. 8, the bar 126 will be slid toward the left from its normal position and if the lower bar 124 be pushed.

toward the rear by the cam 118, as shown in Fig. 9, the bar 126 will be slid toward the right from its normal position. Each ot the bars 123 and 124 is formed with a cut- .out 130 which engages the bushing 23 to limit the sliding motion of the bar.

The slide 126 has pivoted thereto at 131 one end of a long link 132 which extends to a point adjacent the upper end of the lever 112 hereinbeiore referred to. In the Vahl machine the casting 50 is a little further toward the rear than the casting 2O and for this reason, as will be understood from Fig. 10, the lever, of which the arm 112 is affair consisting present instance a built-up in addition to the said arm 112 of a plate 133 in front of said arm 112 and connected thereto by two posts 134 and 135 both riveted into the two plates 112 and 133. The post 135 is hollow and pivoted on a stud 136 which is riveted into a plate 137 secured by screws and dowel pins to the rear face of the casting 20. This built-up lever is spaced from the casting 2O by ay washer 138. The end of the link 132 extends vertically downward just infront of the plate 133 and it has a shouldered and headed pin 140 riveted into it and playing in a slot 141 in the plate 133. This headed pin supports the end of the link 132 but does not positively connect it with the built up lever in any other sense than that. The operative connection between the link and the lever (onsisl's in two dogs 142 each pivoted at 143 to thet'orward face of the plate and each having a stud 144 projecting rearward therefrom and said studs connected by a tension spring 145 which tends to draw them together. lVhcn the parts are in the normal position shown in Fig. 3, the two studs `144 engage the opposite edges of the plate 133 due to the tension of the spring 145, andv the proximate edges o't said dogs embrace between them the vertical part of the link 132. It will be perceived that this combination is such that the tension of the spring 145 tends to draw the lever 112, 133 to the middle normal position shown in Fig. 3, and also to hold the a part, is in the link 132 in its middle position. When said link is forced to move lengthwise in one direction its' lower lend acts on one. of the dogs 142, not very said dog.

As the oppositedog'cannot 'yield to the spring on account of the engagement of its stud 144 with the plate 133` the link can move only by swinging the first mentioned dog against the spring 145 and in doing `that it swings thelever. It will be perceived, however, that it is the tension of the spring that swings the lever so that the action is not positive. This spring therefore performs a plurality of functions. In the first place it centers the parts and yet allows either the link 132 or the lever to move independently of the other, and it operates the. lever when either of the cams 117 or 118 is in action. The whole construction is such that when the cani 117 -operates the upper bar 123 the link 132 is moved toward the operators left, as shown in Fig. 8, or toward the right as viewed in Fig. 4, and frees that slide bar 102 which is priate to the left-hand totalizer 44; and when said link 132 is moved'in the opposite direction by the lower cam 118 it swings the lever 112 in the opposite direction and frees that slide 102 which. is appropriate to the right-hand totalizer 45. These operafar-from the pivot of4 approtime thetotalizer 34-therefore passes to its sub-units position the slide 102 appropriate to the totalizer 44 is freed from thev lever 112. 'If at that moment the said totalizer 44 is clear said slide will still be held by the. pin- 101 but if it is not clear then said pin will also be withdrawn and the slide can drop @wn and llock up the machine as shown in Figs. 4 and 5. Also when the totalizer'33 passes to its sub-units position the other slide 102 will be freed and` if at that instant the other cross totalizer 45 is not clear, then the machine will be locked up. This agrees with the program of o ration for which the machine is set up as ereinbefore described. In case the cross totalizer is clear the next movement of the carriage will move the .cam 117 or 118 away from the slide 123 or 124 and |the spring 145 will. restore the lever 112, link 132, Slide 126 and slides 123 and 124 all to their normal positions where they will-be maintained until said cams 117 andl 118 again come into action. In case the machine-is locked up itcan be unlocked by pressing the button 109 which will force both slides 102 up to or alittle above their normal positions so that they will be caught both by the pins 101 and also by the hooks 113.

The whole construction is such that, as

long as the machine is operated correctly,

the clearance proof devices will not interfere in an-y way with the operation and theyv need not be. noticed by the operator; but if a total is incorrect-ly copied from either of the cross totalizers, then at the next attempted operation of the machine the keys will be found locked and the operator w1ll thereby be notified of his error.

The clearance proof mechanism of this in-l vention has advantages over some other clearance proof mechanisms in respect to its action on the totalizer. In some prior ma` chines there have been feeler combs that were pressed against the register wheels by a spring, said comb in some instances being pressed against the wheels while said wheels were turning, and in other instances the spring pressure came in one way or another on the numeral keys. In the first instance the comb makes a certain amount of friction on the wheels and in either case the stiffness of the spring is necessarily limited because it is not desirable to put much friction on the wheels nor much resistance on the keys. In the present instance the comb is drawn away from the wheels by a light spring and normally does not touch them at all and in fact it never does touch them except\during the jump back of the totalizer when the bar wheels are aligned, and where the comb is under normal spring pressure if such pressure is very light the aligning efectof it is of limited amount. The springs 10() can be made of suitable stiffness so as not to be strong enough to injure the mechanism and yet so as to be strong enough to have an aligning effect on the wheels.

It will of course be understood that various changes can be made in the details of construction and arrangement without departing from my invention.

What I claim as new and by Letters Patent, is

1. In a calculating machine, the combination with a carriage which travels through a series-of calculating zones, and a pluraldesire to secure Vity of totalizers each capable of computing in a .plurality of said zones, of clearance proof mechanism for said .totalizers, andA means controlled by said carriage for bring- 1n said mechanism into actlon for one of said totallzers at one point of-carriage travel .and for another totalizer at another point tion with a carriage which travels through a series oi?A calculating zones, and a plurality of totalizers each capableV of computing in a plurality of said zones, of'a clearance telltale, and mean/s,rr controlled bythe joint action of said carriage and of one of said totalizers for causing said telltale to give a clearance indication at one only of the zones in by the joint action of said carriage and another totalizer for causing said telltale to give aclearance indication at one only of the vzones in which' said other totali'zer comlll in a plurality of said zones, of a device l which that totalizer'computes and controlled no i shifted differently by said carriage at different computing zones, clearance proof mechanism for one of said totalizers controlled in part by said device in one calculating Zone, and clearance proof mechanism for another totalizer controlled in part by Said device in another calculating zone.

5. In a calculating machine, the combination of a carriage which travels through a series of calculating` zones, a totalizer, a spring-operated telltale restrained at two points, means controlled by 'said carriage for releasing said telltale at one point, and means controlled by said totalizer for releasing-` said telltale at the other point.

6. In a calculating machine, the combination with a carriage which travels through a series of calculating Zones and a plurality of totalizers each capable of computing in a plurality of said Zones, of a clearance telltale including spring operated devices one for each totali'Zer and each restrained at two points, means whereby said carriage releases one of said spring operated devices at one calculating zone and another spring operated device at another calculating Zone, and a second restraining means for each of said spring operated devices, one controlled by each of said totalizers.

7. In a calculating machine, theA combination with a totalizer and actuator, one trav eling back and forth relatively to the other, clearance proof mechanism including a feeler in said totalizer, a device in said actuator having an incline and a part connected with said feeler adapted during the relative travel of the totalizer and actuator to rub over said incline, the construction being such that in case the register wheels are in position to allow said feeler to yield said device will not be operated but will be operated when said wheels are in such position that said feeler cannot yield.

8. In a calculating machine, the combination with a totalizer and an actuator having a relative travel forth and back', of a fecler co-operating with the register wheels in the totalizer vin such fashion that said feeler can yield towards said wheels only when all of said wheels stand at Zero, a part connected with said feeler, a spring pressed device in the actuator having an incline over which said part is adapted to rub during the travel in one direction, the construe: tion being such that when the totalizer is clear said device will not be operated but when the totalizer is not clear and the feeler cannot yield said device will be operated; and a clearance telltale controlled by said device.

9. In a calculating machine, the combination with a totalizer and an actuator having relative travel back and forth, of a part associated with said totalizer and adapted to yield when the totalizer is clear but held against yielding when the totalizer is not clear, a ldevice of the actuator having an incline whereby it is operated by said pait during one direction of travel provided said part cannot yield, and means for allowing said part to pass said device idly in the other direction.

10. In a calculating machine, the combination with a carriage which travels through a series of calculating Zones, and two totalizers, of clearance proof mechanism for said totalizers including two spring pressed devices, a latch having two hooks both normally engaged with said devices, and two abutments and co-operating devices, one causing said latch to move in one direction to release one of said devices at one point of carriage travel and the other causing said latch to move in the opposite direction to release the other of said devices at another point of the carriage travel, means whereby one of said totalizers cooperates with one otl said devices to give a clearance indication, and means whereby the other of said totalizers cooperates with the other of said devices.

l1. In aA calculating machine, the combination with a carriage which travels through a series of calculating zones and two totalizers, each adapted to compute in certain of said zones, of two abutments disposed at different points in the carriage travel, two slides one operated by each of said abutments and said slides having oppositely inclined parts, a third slide co-operating with said inclined parts and moved -in one direction by one of them and in the opposite direction by the other one, and clearance proof mechanism brought into operation for one of said totalizers by said third slide when moved in one direction and brought into operation for the other totalizer by said third slide when moved in the opposite direction.

12. In a calculating machine, the com-' bination with two totalizers and actuating means therefor, of clearance proof mechanism including a swinging lever, spring- Voperated parts normally holding said lever in a middle position where said clearance proof mechanism is inoperative, means for swinging said lever in both directions from said middleposition, and means whereby a clearance indication is given for one of said totalizers when said lever isswung in one direction and for the other of said totalizers when the lever is swung in the opposite direction from normal.

13. In a calculating machine, the combination with two totalizers and actuatingT means therefor, of clearance proof mechanism for said totalizer including a swinging lever. two dogs pivoted on said lever and drawn toward each other by a spring. a bar situated between said dogs, means for moving said barA at one time in one direction and at another time in the opposite direction, one of said dogs yielding when said bar is moved one way to swing the lever in one direction from normal and the other dog yielding when said bar is moved the other way y swing the said lever in the other direction from normal, and means for giving a clearance indicationfor one of said totalizers when said lever is swung one way and for the other totalizer when the lever is swung the other way.

14. In a calculating machine, the combination with a carriage which travels through a series of calculating zones, of crosscalculating mechanism including two jumping totalizers that ,are connected to said carriage at eachl of said calculating zones, clearance proof mechanism for each of said totalizers, and selective means controlled by the travel of said carriage for bringing the clearance proof mechanism into action for one totalizer at one time and for another totalizer` at another time.

15. In a calculating machine, the combi'- .nation with. a main carriage which travels .through a series of calc u auxiliarycarriage having a plurality ofA cross footing totalizers mounted thereon, and clearance proof mechanism :for said cross totalizers controlled by the joint'action of said carriages.'

16. In a calculating machine, the combi- Anation with a main carriage which travels through a series of calculating zones and an auxiliary jumpin carriage having a plu-A rality of cross tota izersmounted thereon and having an advance movement and` a jump-back at each of said calculating zones, of clearance proof mechanism for said totalizers operated selectively b the joint action of. the lforward travel of the main carriage and the jump-back of the auxiliary `carria e.

17. In a calculatin machine, the com ination with twor tota izers and a clearance telltale therefor, of two spring-pressed parts one for each totalizer, a restraining means common to both of said parts, means for operating said restraining means'to release said Vparts .one at a time, a second restraining means for eachof said parts controlled by the state of the respective totalizers as atin zones anto clear or not clear,-means whereby each of said clearance telltale, and means for rester ing the parts to normal condition.

18. In a calculating machine, the combination with re ister wheels and a jumpback carriage, o clearance proof mechanism including a feeler andv means operated by the jump-back of said carriage to press said -feeler against said wheels.

19..In a calculating machine, the combi" nation with a carriage and yregister wheels, of clearance roof? mechanism includinga fe'lileil'adapte to be pressed against said w ee brought into contact by the travel of said carriage and thereby acting to bring. the pressure of said s ring in'to aetionto press said feeler towar s ysaid wheels.

20. vIn a calculating machine, the combination .with al carriage and register wheels, of clearance 'proof mechanism including a feeler adapted to be pressed against said Wheels, a spring, and two co-.operating parts brought into contact by the travel, of said carriage and thereby acting tobring the pressure of said spring into action to press a spring, and two cofoperating parts writing mechanism including, a carriage and keys for writing numbers in columns, andgcalculating mechanism including a plurality of cross totalizers, of clearance proof mechanism for said totalizers including telltale means, and .means for automatically operating said telltale means to prove clear.

ance'o one of said totalizers at one column and of another of said totalizers atJ another column.

Signed at the borough ofvManhattan, city of New York, in the county of New York and State of New York, this 11th day `of August, A. D. 1921. l

y ARTHUR F. PooLE. 

